Zoom Lens Voice Coil Assembly for Long-Stroke Precision Positioning
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Solution Overview
Problem
Conventional optical zoom lenses face issues with low rotational speed, high power consumption, susceptibility to electromagnetic interference and noise, poor wear resistance, and low control accuracy due to weak magnetic force and single-position sensing methods, which cannot meet stringent accuracy requirements.
Innovation Solution
A driving assembly with a voice coil motor featuring two magnetic circuit assemblies and oppositely positioned wire groups in a magnetic gap, combined with a position detection device for real-time feedback and closed-loop control, ensuring precise positioning and strong magnetic fields for ultra-long strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long-stroke VCM structure is used to increase driving stroke, then the driving stroke is extended, but the magnetic field strength decreases and motor power is greatly affected
Solution Approach 1:
The voice coil motor is divided into two independent magnetic circuit assemblies, each generating its own magnetic field. This segmentation allows each assembly to maintain strong magnetic fields independently while collectively providing a long driving stroke through the combined effect of both assemblies.
Solution Approach 2:
The patent transitions from a single magnetic field source to a dual magnetic field source arrangement, adding a dimensional aspect to the magnetic circuit design. This enables the system to achieve both long stroke and strong magnetic field strength simultaneously by utilizing two separate magnetic field generation paths.
2Device complexity
If conventional stepper motor drive methods are used, then the structure is simple, but the rotational speed is low and power consumption is high
Solution Approach 1:
The patent replaces the conventional stepper motor mechanical drive system with a voice coil motor that uses electromagnetic fields for actuation. This substitution eliminates the mechanical gears and linkages of stepper motors, enabling higher speeds and lower power consumption while maintaining structural simplicity through direct electromagnetic actuation.
3Device complexity
If existing position sensing methods are used, then the device complexity is low, but the control accuracy is low and out-of-step phenomena occur
Solution Approach 1:
The patent implements a closed-loop feedback control system using a position detection device that continuously monitors the moving group's position and provides real-time feedback to the control device. This feedback mechanism enables precise control by dynamically adjusting the voice coil motor actuation based on actual position information, eliminating out-of-step phenomena and achieving high control accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a driving assembly with ultra-long driving stroke and precise control accuracy, achieving multi-position induction detection and accurate positioning with over 5 um accuracy, enhancing zoom and focus speed while reducing friction and energy loss.
Implementation Method 1
the two magnetic circuit assemblies are configured to generate electromagnetic force with the drive coil, so as to drive the drive coil to drive a moving group fixed to the drive coil to move along the front and rear direction
Data Source
AI summary
Disclosed are a driving assembly, a zoom lens and a camera device. The driving assembly includes a seat body structure, a voice coil motor, a position detection device and a control device. The voice coil motor includes a magnetic yoke, a magnetic body structure and a drive coil. The magnetic body structure is provided at the magnetic yoke. The magnetic body structure includes two magnetic circuit assemblies provided at intervals in an up and down direction, each of the magnetic circuit assemblies includes two magnetic bodies provided at intervals in the up and down direction, and the two magnetic bodies form a magnetic gap. The two wire groups of the drive coil are respectively provided in the magnetic gap formed by the two magnet magnetic bodies of the corresponding magnetic circuit assemblies. The two magnetic bodies generate a magnetic field that is strong enough.